Tannoy floorstander progress

[mpmarino]

I've been wanting to build these for a long time.

After many models and designs I just couldn't make up my mind. I went and built something that I could change easily if I wasn't happy.

My system will be sub augmented so the low lows weren't that important to me but I did want some good extension. So , what I ended up with is a 3ft3 sealed enclosure that I can vent later if I like. In fact I can swap both front baffles and the rear baffle with a little effort. At this internal volume both sealed and vented tracked almost equally in winisd so I'm starting sealed.

It is made of mdf/birch ply/oak ply and the speaker baffle is cotton/carbon impregnated phenolic that I found somewhere (looks like carbon fiber he he). All wood materials were scrap from the garage. There are several coats of lacquer at the moment that will get rubbed out at a later date when it's done curing.

No passive Xover...all active. Whadya think?

[mpmarino]

'nother

..................go

[mpmarino]

and another

waiting........................................... ........................go

dang!

........now.

[mpmarino]

'tis it till thier done.....

goin to flip the record then hit 'submit'.

ok

[mpmarino]

OK,

I fired them up today. GARBAGE! There was no bass, I mean NONE. Sounded like a 5" Vifa. So bad that I thought there was an issue with my active xover and my amps input impedance. A quick swap to my old speakers proves that there is not an electronics issue.

Obviously either winisd didn't plot it right(doubt it) or the parameters I have are way off(probably). While they were playing I removed the rear baffles... Now we're getting somewhere! With the rear baffles removed the extension is surprisingly good . But I hear a resonanse somewhere around ??100-150hz??

I think what I am gonna try next is popping a vent into a rear baffle and experiment there.

If I don't get anywhere there I'll try an aperiodic vent where my future reflex vent goes.

If I don't like that I'll take the rear baffles off entirely and try and tame the resonance... hum, maybe I should start with that ??

any comments appreciated

[GM]

Greets!

Without knowing the driver model and the specs you used, it's kind of hard to comment other than they look nice.......... That, and the cavity resonance will be ~6780"/internal height.

GM

[mpmarino]

thanks for chiming in GM, I was lonely

Yeah, not a lot to go on here. I wish I had the facility to come up with the parameters but I can't take the time to get it together. In other words, I don't know how and I don't have the time to learn it at the moment

So, I'm flying by the seat of my pants. The people over at yahoo tannoy say it's a k3148/k3149

Qts=.4
FS=32Hz
VAS=9.54ft3
Re=5.6R
BL=22
SPL=92dB
12 inch driver

I have no idea how accurate this is....

Thanks for the quick formula, that would put the cavity resonance at ~180hz. I guess my ears aren't too far off

[Salas]

I think you dont employ BSC in your active crossover. Is it right?

[mpmarino]

Originally posted by salas
I think you dont employ BSC in your active crossover. Is it right?

I am pretty sure you are correct, although my understanding of BSC is not too good.

[Salas]

If you dont employ baffle step correction, please follow this experiment. Screw back your back baffles and connect a 1mh coil in series with each woofer. Reduce your HF amp output by 3dB. Listen to decide if you are heading towards some better balance. Let us know so to see for further steps. This must be the Tannoy used in monitor red? SRM 12?